Rigidity in Space
Principle that a gyroscope remains in a fixed position in the plane in which it is spinning By mounting this wheel, or gyroscope, on a set of Gimbalrings, the gyro is able to rotate freely in any direction.If the gimbal rings are tilted, twisted, or otherwise moved, the gyro remains in the plane in which it was originally.Think of the gyro as being aligned with the horizon, and the airplane rotates around it.Stability increases if the rotor has great mass and speedApproximately 15,000 rpm for the attitude indicator and 10,000 rpm for the heading indicator